NE555D Ver la hoja de datos (PDF) - Tiger Electronic

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NE555D

Single Timer

Tiger Electronic 

NE555N/NE555D

comparator output on the trigger terminal becomes high and the timer output becomes high

again. The discharging Tr. turns off and the VC1 rises again.

In the above process, the section where the timer output is high is the time it takes for

the VC1 to rise from Vcc/3 to 2Vcc/3, and the section where the timer output is low is the

time it takes for the VC1 to drop from2Vcc/3 to Vcc/3. When timer output is high, the

equivalent circuit for charging capacitor C1 is as follows:

Since the duration of the timer output high state(tH) is the amount of time it takes for the

VC1(t) to reach 2Vcc/3,

The equivalent circuit for discharging capacitor C1,when timer output is low is ,as

follows:

Since the duration of the timer output low state(tL) is the amount of time it takes for

the VC1(t) to reach Vcc/3,

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